How Worried Should You Be? Petrol in a Diesel Car in Goonabarn
Not started? Then less worried than you likely are. Till your ignition primes your pump, the starter cranks, or the car is driven, petrol in a diesel tank simply sits there and does no harm. Which means the truthful reply to the first Goonabarn question — "have I ruined it?" — usually no. Leave your engine off then phone Petrol in Diesel — that keeps it that way. Read on for three things: the effect petrol has inside a diesel engine, the clues of how far it has got, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to the engine?
Diesel does two jobs on its way through an engine. Oiling comes before burning; it does both. Made to extremely fine clearances, the injectors and your pump depend on your diesel flowing through them to stop their surfaces wearing against one another.
Poorly at the first, not at all at the second: that is petrol. It's thinner than diesel and strips away the protection the system rests on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is made to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That's where the rattling comes from.
The shape of the issue is clear when you put those together. Not contact but movement is what does the harm. Any tank with petrol in it is a fuel issue. Whatever a worn pump sheds travels on, carried by your fuel, into your injectors further along, which is why a pump that has been working on that petrol is where a mechanical issue starts.
Four scenarios we see in Goonabarn: how bad is petrol in a diesel?
Fuelled up, not once started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, your car has been driven there to begin with. With that petrol held inside your tank alone, it's emptied and cleaned right where it stands, and nothing more is needed.
A moment's running, or just your ignition on. Your system has been bled, so petrol has left that tank and reached the filter and the lines. Drain, flush, see to the fuel filter: still usually simple.
Driven a few miles. Now the pump has spent these miles labouring on diluted fuel. Tank, lines, filter, then fresh fuel run through the whole circuit: that is the work, and the way the car was driven counts as much as the miles. On the school run to Foxhole Learning Academy, the mileage is short. Getting as far as Truro, under 15 miles away, makes a very different task — as does any distance on the M5, over 50 miles from Goonabarn, with the motor labouring hard the whole time.
Driven on till it complained — rattling, smoke, an uneven idle, a soft throttle. What you are hearing is your motor reporting fuel that no longer runs like diesel. Leave it where it has stopped: a lay-by, a quiet street, the verge on Trethosa Road. The fuel drain and flush-through still go first, and they deal with it: when a vehicle is pulled over early, lasting damage is very uncommon.
Stories Goonabarn drivers hear about petrol in a diesel
"Top it up the rest of the way with diesel and it'll be fine" — a myth. It will not. Nothing is removed when you top up — the tank simply carries more of the same blend. That guidance supposes a diesel fuel system tolerates petrol by percentage. It does not.
Myth: "A current diesel can cope with a bit of petrol." If anything, the reverse. Lubrication counts more on newer diesels, not less, because their fuel runs through finer components at higher pressure.
This is the one that fools people. Myth: "If it starts and drives, there is no harm done." Feed diesel to a petrol motor and it generally won't run, and so the driver stops — and the harm stops with them. Feed petrol to a diesel and it normally fires up, ticks over and drives away like nothing has happened — all while its pump wears. Running does not mean fine.
An old fix for a distinct problem lies behind this one. Myth: "Add some two-stroke oil and drive the car home." None of what petrol weakened gets put back by it — and afterwards, that tank still holds that petrol.
"Drain it yourself and you are sorted" — a myth, since after it's been running some petrol sits in the filter and lines, waiting to go right back through your pump on the next start. Also, a can of petrol drained at the kerbside is truly risky.
Petrol in a diesel: how does it take place?
Nobody does it on purpose, and it's rarely carelessness. The forecourt makes it simple: the petrol nozzle is the smaller of the two, and it slides into a diesel filler with almost no resistance, while a diesel nozzle mostly will not go into a petrol vehicle at all. So the mistake runs one way.
It happens when habit and the vehicle stop matching. Courtesy car, hire car, or a car that is new. Two cars on one driveway, one petrol, one diesel. Your usual forecourt, its pumps now in a different order. Filling up in a rush on the way to St Austell, with a train to catch. A new-to-you diesel Volkswagen Golf, its first fuelling, and a driver accustomed to petrol: precisely when it happens. With rain, a call arriving, or a car full of children to deal with, the hand simply does what it has always done.
Avoiding petrol in a diesel next time you fill up in Goonabarn
- Check the petrol pump, not the colour. In the UK unleaded handles are usually green and diesel black, yet not on each forecourt. The label is what counts.
- Many motors state the fuel inside the filler flap or on the cap, so check it on your first fill in any vehicle you do not know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, for a household with one of each.
- Say it before you lift it. On your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the petrol pump. It sounds daft and it does the trick.
- Mistakes like this are straightforward to make while your mind is on something else, and so the phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to refuse a petrol nozzle, and add-on devices are available for the remainder. Treat it as a safety net, and keep checking the pump.
- Spotting it mid-fill? Stop there and then. A thinner mix follows from less petrol inside your tank, but the next stage stays the same: do not start the vehicle.
Petrol already in a diesel in Goonabarn? Start here
Then the order of things is short. Leave it unstarted, with the ignition switched off too. Ask the staff to help you push it away from the pump if you're still on the forecourt, whether that's the nearest petrol station or anywhere else. Call 0333 366 0103 next, with three facts — your fuel, the rough amount, and if it has run.
AdBlue, not petrol? Then say so. Corrosion and deposits, not lost protection, make it a different problem — Goonabarn has a page all for it.
One petrol in a diesel task around Goonabarn costs more than another. Why?
Four different jobs sit behind the four situations above — which is why there's no fair single price. What shifts the cost is chiefly which of them you are in. Beyond that it's the ratio — how much petrol went in against how much your tank holds — and then where the vehicle is and whether our van can reach it safely.
Ahead of any quote, not after, we ask three questions: the fuel that got in, its volume, and if it has run. That is why. With those replies, there is a straight figure rather than a range.
About Goonabarn, briefly
Goonabarn is a small hamlet situated on the banks of a river in Cornwall, with Goonabarn being one of the many rural settlements in the region. Goonabarn sits at an elevation of 171 metres, overlooking the surrounding countryside, and Goonabarn is located near other small places such as Goonamarris and Goverseth. Goonabarn has a population of around 595 people, with Goonabarn being characterized by its terraced housing.
Fuel drain cover across Cornwall, Goonabarn included
Petrol in diesel jobs in Goonabarn — part of the PL postcode area — go to vans that also cover the locations about it, Goonamarris, Goverseth and Carloggas included. The vehicle does not need to come to us: our engineers drain on a forecourt, in a supermarket car park, in a lay-by or on your own driveway.
At the petrol pump in Goonabarn, still?
Nothing beats it: that's where you are. Switched off it remains; then phone.